US2979149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker apparatus
Assignee: Individual
•
Filing: 1954-09-27
•
Granted: 1961-04-11
•
Expires: 1974-09-27
Abstract
No abstract record available.
Inventors
- 👤 Carlsson Stig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:23
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/323
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2373692A
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US2610694A
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FR913655A
Cited
FR54541E
Cited
GB641668A
Cited
US2722990A
Cited
US2694462A
Cited
US2701025A
Cited
US2824617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |